Take a walk on the dark side: Intriguing black-and-white photos of animals shot using only natural light. By STEVE ROBSON . Published: 09:22 EDT, 13 December 2012 | Updated: 10:25 EDT, 13 December ...

At first glance, eastern quolls seem like ordinary marsupials. Native to Tasmania, Australia, they’re the size of house cats ...

National Geographic stories take you on a journey that’s always enlightening, often surprising, and unfailingly fascinating.

From people's clothes blending into the background to animals who are tricky to spot against home interiors, these amusing optical illusions are bound to make you look twice.

REUTERS/Jo Yong hak A handout photo shows transgenic fluorescent green pigs glowing in dark (L) and walking with normal pigs in Taipei January 13, 2006. in Taipei January 13, 2006.